Alexander heilbrun



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ALEXANDER HElLBRUN, 0F CINCINNATI, OHIO.

Letters Patent No, 71,7:5-3, dated December 3, 1867.

IMPROV'EhlENT IN STEREOSGOPES.

TO WHOM ITMA Y CONCERN:

Be it known that I, ALEXANDER HEILBRUN, of Cincinnati, Hamilton county, Ohio, have invented a new and useful Improved Stereoscope; and I'hereby declare the following to be a full, clear, and exact description thereof, reference being bad to the accompanying drawings, making part of this specification.

My invention relates to a'simple, compact, and effective device for the exhibition of stereoscopic pictures. Figure 1 is a perspective view of a stereoscope embodying my improvements. I

Figure 2 is a longitudinal section thereof. I Figural? is a horizontal section at the line a: z, fig. 2. v p A is a rectangular box, closed at sides and bottom, but openable at top by the unfolding of two flaps, to wit, a single flap, B, and a flap in two parts or leaves, 0 D, connected by a hinge, E. Extending atbwart the said open top, near its mid-length, is a. board, F, having two equal apertures ff, through which the pictures are seen, and which form a framework thereto. Journalled at a. common level near the top of the box are two shafts G H, armed with sprockets I, which propel a pair of endless chains, J. Stretching transversely from chain to chain, and at equal distances from each other, are rods-K, terminating in outwardly projecting fingers L. One shaft, G, projects tothe outside of the box, and has a knobor handle, M, and is armed with a ratchet wheel and pawl, (see dotted lines N,) to prevent retrogression. Journalled a little in advance of and in the plane of the shaft H is a roller, 0, over which my peculiarly connected slides overturn in manner hereafter I explained. Journalled vertically near the respective sides of the box, and a little in advance of the shaft H, are two shafts P, having each one two arms Q R, which project horizontally at right angles to each other, and of which the arm Qhas'its endq curved forward, and the arm R has a perpendicular portion, 7', which operates on each slide in succession to press it forward for the return movement. S is an elevated track, (formed'of two parallel wires,) along which the slides travel in their'lower or return movement. '1 are two endless ribbons, to which are riveted or otherwise secured clips- U, which, in conjunction with similar clips V, connected to the former by extensiblecords W, serve to hold any picture. that may be placed in them, and which, in connection with saidpicture, are here spoken of collectively as the slides or scenes. X are spring-catches or detents,

to preventany retrogression of the slides after being caught and forwarded by the arms. Y are spiral springs,

which restore the arms to their initial position, (see strong lines, figs. 1, 2, and 3.) A stationary partition, Z,

curved upward at its front end, serves to confine the slides to the track S, until the proper juncture for their consecutive'elevation, (see short arrows 1 2, fig. 2.) The leaf D of flap C D has guides 12, for a sliding leaf, 0, which carries a. lens-holder, c,"w hich can be slid up or down, and secured in any position by manipulation of a screw, d. l A slot, 6, in the flap 13, receives the lenses the closed or folded condition of the apparatus. g' are springs, (one shown,) which serve to guide and hold the slides in their uppermost or efl'ective position, (see 3, fig: 2.) Grooves it, on the under side of the board F, permit the passage of the fingers L.

The operation is as follows: The slides having been provided with the desired pictures, the handle M is rotated as per arrow, and one pair of the fingers'L catching against a slide, forward it to the position 3, and at the same time bring four others of the slides to the positions 1, 2, 4, and 5, respectively. While this is taking 'place, another pair of the fingers L, acting on the arms Q, vibrates the arm B, so as to press one of the slides past the catches X, which having been accomplished, the said arms are suddenly retracted by the agency of the springs Y, so as to be ready for the next slide, which reaches position 5 by capsizing over the roller 0, (see dotted lines 4,) so as to assume the reversed position shown at 5, from which position it is pushed forward on its return passage by the arms R, as before stated. In order to enable the box to be set at any desired incline. tion to the eye of the observer, I hinge to the rear bottom corner afoot, 2', having aslotted bracket, j, which being traversed by a. screw, It, enables the foot to be secured in a more or less protruded position, so as to elevate, to the desired extent, the rear end of the box. I do not propose to restrict myself to the precise form here represented for example, a wheel may be made to replace the two shafts and chains, and the instrument may be so arranged as to enable inspection from the front instead of from above, as in the present illustration. The apparatus may be adapted to transparencies by providing one or more side doors, as indicated by red lines I.

I claim herein as new, and of my invention- 1. The arrangement of the two shafts Grand H, endless chains J, fingers L, arms Q R, roller 0, and catches X, in the described combination with the series of slides secured to one or more endless ribbons '1, in the manner and for the purpose set forth. I

2. In the described combination, the fingers L, groove 71, roller 0, arms Q and R and the catchesX, for

' the purpose set forth.

3. In combination with the elements of claim 1, I claim the springs g, for holding the slides to' the under side of the open frnine F. s

4. The guard or partition Z, curved upward at its front end, as and for the purpose stated.

5. The hinged and folding foot 1', having the bracket) and screw k, for the purpose set forth. In testimony of which invention, I hereunto set my hand.

ALEX. HEILBRUN.

Witnesses:

G110. H. KNIGHT, JAMES H. LAYMAN. 

